SOLR-5782: Move CHANGES entry to 4.7.1

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1579311 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5881: Upgrade zookeeper to 3.4.6 (merge trunk r1579275)


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1579316 13f79535-47bb-0310-9956-ffa450edef68